Refactor/authentication

[shreelakshmijoshi]

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• Please check if the PR fulfills these requirements 📋

• The commit message follows our guidelines : link
• Tests for the changes have been added (for bug fixes/features)
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• What kind of change does this PR introduce? (Bug fix, feature, docs update, refactor, chore, test, config) 💁 📜
  refactor

• RoutingContextHelper to add and fetch information from routing context using static methods
• Made the create method non-static in Auth Handler class
• Refactored IudxRole to DxRole
• Added a separate AuthHandler for Verify Policy

• Checklist for the current PR 📃

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• pmd, check style issues are resolved locally
• I have added reviewers to check the proposed changes

[jenkins-datakaveri]

Build finished.